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Discontinued Operations (Cash Flow Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |
Net cash provided by discontinued operating activities |  | $ 0 | $ 12,753
Hereford Production Facility | Discontinued Operations, Disposed of by Sale |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |
Net cash provided by discontinued operating activities | $ 8,462 |  | 12,753
Net cash used in discontinued investing activities | $ (2,807) |  | $ (3,762)

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